1 //===- GNUInfo.h ----------------------------------------------------------===// 2 // 3 // The MCLinker Project 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 #ifndef MCLD_TARGET_GNUINFO_H 10 #define MCLD_TARGET_GNUINFO_H 11 #include <llvm/ADT/Triple.h> 12 #include <llvm/Support/ELF.h> 13 14 namespace mcld { 15 16 /** \class GNUInfo 17 * \brief GNUInfo records ELF-dependent and target-dependnet data fields 18 */ 19 class GNUInfo 20 { 21 public: 22 GNUInfo(const llvm::Triple& pTriple); 23 24 virtual ~GNUInfo() { } 25 26 /// ELFVersion - the value of e_ident[EI_VERSION] 27 virtual uint8_t ELFVersion() const { return llvm::ELF::EV_CURRENT; } 28 29 /// The return value of machine() it the same as e_machine in the ELF header 30 virtual uint32_t machine() const = 0; 31 32 /// OSABI - the value of e_ident[EI_OSABI] 33 uint8_t OSABI() const; 34 35 /// ABIVersion - the value of e_ident[EI_ABIVRESION] 36 virtual uint8_t ABIVersion() const { return 0x0; } 37 38 /// defaultTextSegmentAddr - target should specify its own default start address 39 /// of the text segment. esp. for exec. 40 virtual uint64_t defaultTextSegmentAddr() const { return 0x0; } 41 42 /// flags - the value of ElfXX_Ehdr::e_flags 43 virtual uint64_t flags() const = 0; 44 45 /// entry - the symbol name of the entry point 46 virtual const char* entry() const { return "_start"; } 47 48 /// dyld - the name of the default dynamic linker 49 /// target may override this function if needed. 50 /// @ref gnu ld, bfd/elf32-i386.c:521 51 virtual const char* dyld() const { return "/usr/lib/libc.so.1"; } 52 53 /// isDefaultExecStack - target should specify whether the stack is default 54 /// executable. If target favors another choice, please override this function 55 virtual bool isDefaultExecStack() const { return true; } 56 57 /// commonPageSize - the common page size of the target machine, and we set it 58 /// to 4K here. If target favors the different size, please override this 59 virtual uint64_t commonPageSize() const { return 0x1000; } 60 61 /// abiPageSize - the abi page size of the target machine, and we set it to 4K 62 /// here. If target favors the different size, please override this function 63 virtual uint64_t abiPageSize() const { return 0x1000; } 64 65 protected: 66 const llvm::Triple& m_Triple; 67 }; 68 69 } // namespace of mcld 70 71 #endif 72 73
